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New genetic study: More evidence for modern Ashkenazi Jews’ ancient Hebrew patrimony

New genetic study: More evidence for modern Ashkenazi Jews' ancient Hebrew patrimony

IsraelI hail from the so-called Ashkenazi branch of Jews, who account for the great majority of all Jews in the world today. Ashkenazis are distinguished by the historical fact that, over the last couple of thousand years or so, they propagated throughout Europe, generating and maintaining tens of thousands of distinctly Jewish communities in diverse countries spanning the entire continent. My dad was born in Lithuania; my mom’s mom came from an Eastern European region that has belonged to any one of about a half-dozen countries, depending on what particular year you happen to be talking about; and my mom’s dad grew up in Russia, near the Black Sea.

Tradition holds, though, that Ashkenazi Jews ultimately trace their origins straight back to ancient Israel, whence most Jews were expelled en masse in 70 CE by their Roman conquerors and sent skittering to all parts of the globe. (Jews who initially fled to Spain and Portugal are referred to as Sephardic. Those who took up residence in Iran, Turkey, Iraq and Northern Africa, are designated as Mizrahi.)

But in the late 1970s I read what was then a recent book titled The Thirteenth Tribe, written by polymath Arthur Koestler, advancing a theory that today’s Ashkenazis descend not from the Holy Land but, rather, from Khazaria, a medieval Turkic empire in the Causasus region whose royals, caught between the rock of Islam and the hard place of Christendom, chose the politically expedient course of converting to Judaism. That hypothesis has become highly politicized, with some groups holding that Ashkenazis, who constitute half of Israel’s current population, are colonialist interlopers with zero historical claim to the land of Israel.

Plausible at the time, the Khazar-origin premise has crumbled under the onslaught of modern molecular genetics. The latest volley: a study published this week in Nature Communications. The study’s senior author, Stanford geneticist Peter Underhill, PhD, works in the lab of  Carlos Bustamante, PhD, whose high-resolution techniques have highlighted the historical hopscotch of other migratory peoples.

Underhill, Bustamante and their co-authors analyzed the Y chromosome – a piece of the human genome invariably handed down father-to-son – of a set of Ashkenazi men claiming descent from Levi,  the founder of one of the Twelve Tribes of Israel. (Names such as Levy, Levine and Levitt, for example, bespeak a Levite heritage.)

If Ashkenazis were the spawn of Khazar royals, their DNA would show it. But those Y chromosomes were as Levantine as a levant sandwich. The same genetic “signature” popped up on every Levite sampled (as well as a significant number of non-Levite Ashkenazis), strongly implying descent from a single common ancestor who lived in the Fertile Crescent between 1,500 and 2,500 years ago. That signature is absent in the Y chromosomes of modern European non-Jewish men, and in male inhabitants of what was once Khazaria.

Yes, 2,000 years is a long time, and a fellow gets lonely. Genetic studies of mitochrondria – tiny intracellular power packs that have their own dollop of DNA and are always inherited matrilineally – have conflicted (contrast this with this) but, in combination with broader studies of entire genomes, suggest that a bit of canoodling transpired between Ashkenazi men and local European women, in particular Italian women, early in that two-millenia European sojourn.

I can relate. My wife is 100 percent Italian by heritage, and my daughter by my first marriage is half-Italian.

Previously: Caribbean genetic diversity explored by Stanford/University of Miami researchers, Stanford study investigates our most-recent common ancestors and Stanford study identifies molecular mechanism that triggers Parkinson’s
Photo by cod_gabriel

7 Responses to “ New genetic study: More evidence for modern Ashkenazi Jews’ ancient Hebrew patrimony ”

  1. Swisstoons Says:

    Interesting piece. But I believe “Levantine” refers to the Levant (Lebanon & Syria), not to the descendants of Levi.

  2. dyinglikeflies Says:

    Science and proof will not discourage those who insist todays Jews have no historical connection to the land, Jews are colonists there, ancient Jews and the Holy Temple never existed (sound crazy? Arafat said that), Jews are directly descended from monkeys (check with your friendly neighborhood Muslim preacher on that one) etc. etc. But finding out we have always had a shot with Italian girls is good to know.

  3. Bodil Zalesky Says:

    I agree with Swisstoons, this is very interesting. And also that “Levantine” has to do with “levante” (Italian) i.e. from where the sun rises (the East) as “ponente” means from where the sun sinks (the West) – but that is of course only a small detail in this text.

  4. Martin Mould Says:

    I assumed that the author used Levantine in its geographic sense (eastern Mediterranean origin), not as a misunderstood connection with Levites. It’s also intriguing that those who “accuse” Ashkenazim of Khazar ancestry point to how Slavic-Germanic we look, whereas the Khazars were/looked Turkic-Georgian.

  5. Ellie Kesselman Says:

    I am curious regarding the researchers’ choice of population sample. According to my father and grandfather, Cohans are by definition, the patrilinear descendants of Aaron the High Priest, younger brother of Moses. The second of the three, um, strata of Jews of the Diaspora were Levites, the descendants of Levi, as SwissToons said. There was nothing particularly Levantine about the Levites. They were the artistic class, and cared for the synagogue. Well, that was my understanding.

    I am glad for resolution to the Khazar origin myth. Minor issue: This word choice jarred, “If Ashkenazis were the spawn of Khazar royals, their DNA would show it.” Spawn? We’re not spawn!

    I like the map of Israel, very much. Might there be any provenance information? I’d to view more of it!

  6. Bruce Goldman Says:

    Ellie Kesselman: Aaron himself was Levite, making Kohanim a subset of that tribe. And while I admit to indulging my sense of wordplay, I meant the term “Levantine” as a geographical reference (dictionary definition: “a person who lives in or comes from the Levant”), not a cultural one. That is, Levites’ genes show that they sprang from the Levant, not the Caucasus.

    I can see how the term “spawn” could be jarring, and I assure you that I used it ironically (I’m an Ashkenazi myself).

  7. Bruce Goldman Says:

    Ellie Kesselman: I forgot to mention that if you click on the link highlighting the words “Photo by cod_gabriel” you will be directed to the Flickr.com page containing a larger version of the map and, among other things, an information icon (“i” in a circle) that will provide attribution guidelines.

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